Martin Luther’s letter “To The Christian Reader” was written in 1545, a year before he died. It has a tenor of reconciliation. He asks readers to cut him a little slack for at one time being a monk and upholding the Pope’s theology to the point that he would have “committed murder” to keep it in force.
A simple quick read overview might be this excerpt:
“Therefore, Christian reader, thou wilt find in my earliest books and writings how many points of faith I then, with all humility, yielded and conceded to the pope, which since then I have held and condemned for the most horrible blasphemy and abomination, and which I would have to be so held and so condemned forever. Amen.”
Here is the letter in it’s original context, translated into English: